Indirect water heater



vJuly 28, 1936. A. B. wlLDx-:R

INDIRECT WATER HEh'VlER Filed Jan. 18, 1935 Patented July 28, 1936 fVAllenr B. Wilder',` Chicago, Ill., assignor -to e Parkinson Heater Corporation, Chicago, Ill., a

corporation `of Illinois 4 Application January 18, .1935,I Serial No. 2.416

i Claim.. 01'. 257-230 'My'present invention relates to improvements 'in conduction or indirect water heaters ofthe outside type. Conduction or indirect water-heaters 'consist of loops or coils of tubing, through which the, water to be heated is circulated, which tubing is disposed so that it is surrounded by the heating medium, usually the boiler water. Such heating coils are not infrequently inserted directly Within the water compartment of the boiler. An

outside type conduction heater is one in which a casing, other than the water compartment of the boiler, is provided Within which the heat transfer tubing through which the water to be heated is circulated is disposed, the outside casing being connected with the boiler so as to secure a circulation, usually thermo-gravitational, of the boiler water through the casing and about the tubing.

In the designing of such apparatus no attention has formerly been paid to increasing the efficiency thereof by designing the structure so as tosecure as efficient as possible a circulation of the boiler water through the outside casing. An increase in efficiency has heretofore been entirely sought and secured through an increase in the tube area through which the water to be heated is circulated and an increase in capacity of the casing in which the tubes are installed. Heretofore outside type conduction heaters have been excellent mud traps for sedimentation from the boiler water and also from the water to be heated.

I have had as my objects in the creation of the apparatus herein described and illustrated the increase of the eiciency of the apparatus by reason of securing a more eflicient boiler water circulation therethrough, and the prevention of the sedimentation from the boiler water therein, and I have also had as an object the provision of a structure in which the heat transfer tubing may be cleaned more efficiently and with less trouble.

I have attained the foregoing objects by means of the structure illustrated in the accompanying drawing, in which- Fig. 1 is a front elevation of an outside type conduction heater, partially in section, on line l-I of Fig. 2.

Fig. 2 is a top plan of the structure shown in Fig. 1. Y

Fig. 3 is a transverse section on line 3--3 of Fig. 1.

Fig. 4 is a fragmental elevation of a typical boiler with my structure in assembly therewith.

Similar reference characters refer to similar parts throughout the respective views.

The outside casing 5 is of a generally rectangular section, as best shown in Fig. 3, the center 6 of the top wall, however, being peeked, as shown in Fig.-l 1, so as to permit the entrance port I vfor the admission of the boiler water and opposite 5 clean out opening 8, which is normally closed by a plug, being positioned at as elevated a point as possible with respect to the casing 5. The bottom of the casing has the walls 9 from the ends of the casing and the walls IIJ from the sides of lo the casing slope downwardly to converge upon a hub I I which is interiorly threaded for connection with the return I2 to the boiler I3, the entrance port 'I of the casing being connected by a nipple I4 with the boiler I3 just below the water l5 line thereof. The rectangular ends of the casing are closed by webs I5 and I6, which webs are perforated for receiving the ends of the heat transfer tubes I1. Beyond the web I5 the casing is continued and provided with a transverse par- Q0 tition Ila to provide an entrance chamber I8 communicating with the lower rank of heat transfer tubes and a discharge chamber I9 communicating with the upper rank of heat transfer tubes. Beyond the web I6 the casing is continued to pro- 25 vide a single chamber 20 into which ows the Water through the entrance chamber I8 through the lower rank of heat transfery tubes and from which ows the Water from the upper rank of heat transfer tubes to the discharge chamber I9. 30

An entry port 2| is provided upon the bottom of the extended end of the casing communicating with the entrance chamber I8 and a discharge port 22 is provided upon the top of the casing communicating with the discharge chamber I9. g5 The ends of the chambers I8 and I9 are closed by a single plate 23 secured in position by suitable machine screws 24, or in any other suitable way, and the chamber 20 is closed by a plate 25 secured in position in the same manner. The service 4 0 water supply pipe 26 is attached to the inlet port 2l andthe pipe 2l leading to the fixtures is secured to th-e discharge port 22.

When this device is functioning the boiler water is heated and service water is passing 45 through the tubing I1 from the port 2I and out through the port 22 to the fixture or to the hot water storage tank. Such a condition results in the cooling of the boiler water in the vicinity of the tubes Il. The cooling of this water causes 5D its contraction and increase of weight and it sinks down through the inclined bottom of the casing through the return pipe I 2 to the bottom of the boiler and as the cold water sinks by its increased weight the lighter, hotter boiler Water 55 ows in from the top of the boiler through the pipeV I4 and the port 1. The. length of the leg or column Aof falling cooled water in the casing 5 and pipe I2 materially aifects the rapidity of the circulation. If the nipple HlV were connected with the top of the casing, instead of the side of the casing at the top, it would be necessary to subtract the height of the connection from the length of the return as the Weight of the length of the return would actually have to pull the .lighter water down in a direction in Whichjt naturally would not flow until it came in contact with the heat transfer tubes Il. f Y f In the construction hereinbefore described and illustrated none of the Weight of the descendingk cooled leg of water is sacrificed in pullinghot; Water down into contact Vwith the heat transfer tubes. The inclined or oblique walls of theloot-v L tom ofV the casing, together with the increased circulation of the boiler water therein, prevents the precipitation of sedimentation in the casing and'all sedimentation is returned to the boiler Where its removal is ordinarily provided for.`

It is obvious by a glance at Figs. 1 and 3 of the 2,049,185 l Y o Y drawingA that when the end plates 23V and 25 arev removed from the casingpthe entire length of the heat transfer tubes I1 are opened for cleaning out in a most thorough and satisfactory manner.

Thel additional circulation ofv boiler water I" ysecure through the heater casing secures a surprising increasein eiciency in the heating of the,y service Water supply..A l

Having described my invention what I claim is new' and desire to secure by Letters Patent is:V

with tubes extending therebetween, an inlet and partment vat the other end of said casing with ywhich all of said tubesrcommunicate, removable closures for the compartments at the ends ofsaid casing, an inlet port to said casing on a level with the top row of said tubes, and a hub atfthe lower end o f said hopper for connection with the return to the boiler. Y Y f n Y ALLEN B. WILDER. f

l0 YA conduction Water heater of an outside type,V

comprising a casing having a hopper bottom and 'havingf opposed parallel tube webs or headers 

